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NCERT Solutions › Chemistry › Chapter 9

Chapter 9: Hydrogen

NCERT Solutions for CBSE Class 10 Chemistry — 9 solved questions with detailed explanations.

9
Questions
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Solved Questions

Q1. Heavy water has the formula:

Difficulty: Easy · Topic: Isotopes of Hydrogen

Solution

Heavy water is D₂O (deuterium oxide). Deuterium (D or ²H) has mass number 2.

Q2. The structure of water molecule is:

Difficulty: Easy · Topic: Water Structure

Solution

Water has sp³ hybridization with 2 bond pairs and 2 lone pairs, giving a bent shape with bond angle ~104.5°.

Q3. Hydrogen has isotopes:

Difficulty: Easy · Topic: Hydrogen

Solution

Protium, Deuterium, Tritium.

Q4. Hard water contains salts of:

Difficulty: Easy · Topic: Hydrogen

Solution

Ca and Mg.

Q5. Temporary hardness is removed by:

Difficulty: Easy · Topic: Hydrogen

Solution

boiling.

Q6. Permanent hardness is removed by:

Difficulty: Easy · Topic: Hydrogen

Solution

washing soda.

Q7. Hydrogen is used as fuel because of its:

Difficulty: Easy · Topic: Hydrogen

Solution

high calorific value.

Q8. In electrolysis of water, H₂ is collected at the:

Difficulty: Easy · Topic: Hydrogen

Solution

cathode.

Q9. Hydrogen peroxide acts as:

Difficulty: Easy-Medium · Topic: H2O2

Solution

H₂O₂ can act as both oxidizing agent (reduced to H₂O) and reducing agent (oxidized to O₂).

Other Chapters in Chemistry

Ch 1: Some Basic ConceptsCh 2: Structure of AtomCh 3: Classification of ElementsCh 4: Chemical BondingCh 5: States of MatterCh 6: ThermodynamicsCh 7: EquilibriumCh 8: Redox ReactionsCh 10: s-Block ElementsCh 11: p-Block ElementsCh 12: Organic ChemistryCh 13: HydrocarbonsCh 14: Environmental Chemistry

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